Set of polarizing plates having a young's modulus and front-plate-integrated liquid crystal display panel comprising the same

Patent metadata

Field	Value
Publication number	US-9740044-B2
Application number	US-201415028246-A
Country	US
Kind code	B2
Filing date	Oct 1, 2014
Priority date	Oct 10, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

Provided are a set of polarizing plates comprising a front-plate-integrated polarizing plate to be disposed at a viewing side of a liquid crystal cell and a back-side polarizing plate to be disposed at a back side of the cell, and a front-plate-integrated liquid crystal display panel including the set of polarizing plates. The front-plate-integrated polarizing plate including a front-side polarizing plate and a front plate disposed at a viewing side of the front-side polarizing plate, being stuck via an ultraviolet curing type resin or a pressure sensitive adhesive, and having a Young's modulus of at least 2 GPa. A distance d1 to the liquid crystal cell from the surface of a polarizer of the front-side polarizing plate is larger than a distance d2 to the liquid crystal cell from the surface of a polarizer of the back-side polarizing plate.

First claim

The invention claimed is:

1. A set of polarizing plates comprising a front-plate-integrated polarizing plate to be disposed at a viewing side of a liquid crystal cell, and a back-side polarizing plate to be disposed at a back side of the liquid crystal cell, the front-plate-integrated polarizing plate including a front-side polarizing plate and a front plate, the front plate being disposed at a viewing side of the front-side polarizing plate, being stuck via an ultraviolet curing type resin or a pressure sensitive adhesive, and having a Young's modulus equal to or greater than 2 GPa, wherein
both the front- and back-side polarizing plates are each a polarizing plate having a polarizer composed of a polyvinyl alcohol-based resin film having at least one surface with a transparent protective layer composed of a transparent polymer film laminated thereon,
a distance d1 to the liquid crystal cell from that surface of a polarizer of the front-side polarizing plate which is farther away from the front plate is larger than a distance d2 to the liquid crystal cell from that surface of a polarizer of the back-side polarizing plate which is closer to the front plate,
d1 is 100 μm or less, and d2 is 5 μm or more, and
a total thickness of one or more transparent polymer films that the front-side polarizing plate has is larger than a total thickness of one or more transparent polymer films that the back-side polarizing plate has.

2. The set of polarizing plates according to claim 1 , wherein a transparent protective layer composed of a transparent polymer film having an in-plane phase retardation is laminated on a surface of at least one of that side of the polarizer of the front-side polarizing plate which is farther away from the front plate and that side of the polarizer of the back-side polarizing plate which is closer to the front plate.

3. The set of polarizing plates according to claim 2 , wherein the front-side polarizing plate further comprises, on the side of its polarizer farther away from the front plate, another phase retardation plate composed of a transparent polymer film.

4. The set of polarizing plates according to claim 1 , wherein the back-side polarizing plate is provided, on a side of its polarizer farther away from the front plate's side, with another optical film.

5. The set of polarizing plates according to claim 1 , wherein both the front-side polarizing plate and the back-side polarizing plate have a rectangular shape having a longer side and a shorter side, and the front-side polarizing plate has its absorption axis approximately parallel to a direction of the shorter side and the back-side polarizing plate has its absorption axis approximately parallel to a direction of the longer side.

6. A front-plate-integrated liquid crystal display panel comprising the set of polarizing plates according to claim 1 , and a liquid crystal cell, wherein
the front-plate-integrated polarizing plate is stuck, at its polarizing plate's side, on a viewing side of the liquid crystal cell; and
the back-side polarizing plate is stuck on a back side of the liquid crystal cell.

7. The front-plate-integrated liquid crystal display panel according to claim 6 , having a warping amount in absolute value of 0.5 mm or less when heated at 85° C. for 240 hours.

8. A front-plate-integrated liquid crystal display panel comprising the set of polarizing plates according to claim 2 , and a liquid crystal cell, wherein
the front-plate-integrated polarizing plate is stuck, at its polarizing plate's side, on a viewing side of the liquid crystal cell; and
the back-side polarizing plate is stuck on a back side of the liquid crystal cell.

9. A front-plate-integrated liquid crystal display panel comprising the set of polarizing plates according to claim 3 , and a liquid crystal cell, wherein
the front-plate-integrated polarizing plate is stuck, at its polarizing plate's side, on a viewing side of the liquid crystal cell; and
the back-side polarizing plate is stuck on a back side of the liquid crystal cell.

10. A front-plate-integrated liquid crystal display panel comprising the set of polarizing plates according to claim 4 , and a liquid crystal cell, wherein
the front-plate-integrated polarizing plate is stuck, at its polarizing plate's side, on a viewing side of the liquid crystal cell; and
the back-side polarizing plate is stuck on a back side of the liquid crystal cell.

11. A front-plate-integrated liquid crystal display panel comprising the set of polarizing plates according to claim 5 , and a liquid crystal cell, wherein
the front-plate-integrated polarizing plate is stuck, at its polarizing plate's side, on a viewing side of the liquid crystal cell; and
the back-side polarizing plate is stuck on a back side of the liquid crystal cell.

Assignees

• Sumitomo Chemical Co

Inventors

• Kawamura Takahito

Classifications

• G02F2001/133567

  Physics · mapped topic

• G02F2201/54

  Arrangements for reducing warping-twist · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title